path: root/tools/power/acpi/os_specific/service_layers/osunixxf.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: osunixxf - UNIX OSL interfaces
 *
 * Copyright (C) 2000 - 2023, Intel Corp.
 *
 *****************************************************************************/

/*
 * These interfaces are required in order to compile the ASL compiler and the
 * various ACPICA tools under Linux or other Unix-like system.
 */
#include <acpi/acpi.h>
#include "accommon.h"
#include "amlcode.h"
#include "acparser.h"
#include "acdebug.h"

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <sys/time.h>
#include <semaphore.h>
#include <pthread.h>
#include <errno.h>

#define _COMPONENT          ACPI_OS_SERVICES
ACPI_MODULE_NAME("osunixxf")

/* Upcalls to acpi_exec */
void
ae_table_override(struct acpi_table_header *existing_table,
		  struct acpi_table_header **new_table);

typedef void *(*PTHREAD_CALLBACK) (void *);

/* Buffer used by acpi_os_vprintf */

#define ACPI_VPRINTF_BUFFER_SIZE    512
#define _ASCII_NEWLINE              '\n'

/* Terminal support for acpi_exec only */

#ifdef ACPI_EXEC_APP
#include <termios.h>

struct termios original_term_attributes;
int term_attributes_were_set = 0;

acpi_status acpi_ut_read_line(char *buffer, u32 buffer_length, u32 *bytes_read);

static void os_enter_line_edit_mode(void);

static void os_exit_line_edit_mode(void);

/******************************************************************************
 *
 * FUNCTION:    os_enter_line_edit_mode, os_exit_line_edit_mode
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Enter/Exit the raw character input mode for the terminal.
 *
 * Interactive line-editing support for the AML debugger. Used with the
 * common/acgetline module.
 *
 * readline() is not used because of non-portability. It is not available
 * on all systems, and if it is, often the package must be manually installed.
 *
 * Therefore, we use the POSIX tcgetattr/tcsetattr and do the minimal line
 * editing that we need in acpi_os_get_line.
 *
 * If the POSIX tcgetattr/tcsetattr interfaces are unavailable, these
 * calls will also work:
 *     For os_enter_line_edit_mode: system ("stty cbreak -echo")
 *     For os_exit_line_edit_mode: system ("stty cooked echo")
 *
 *****************************************************************************/

static void os_enter_line_edit_mode(void)
{
	struct termios local_term_attributes;

	term_attributes_were_set = 0;

	/* STDIN must be a terminal */

	if (!isatty(STDIN_FILENO)) {
		return;
	}

	/* Get and keep the original attributes */

	if (tcgetattr(STDIN_FILENO, &original_term_attributes)) {
		fprintf(stderr, "Could not get terminal attributes!\n");
		return;
	}

	/* Set the new attributes to enable raw character input */

	memcpy(&local_term_attributes, &original_term_attributes,
	       sizeof(struct termios));

	local_term_attributes.c_lflag &= ~(ICANON | ECHO);
	local_term_attributes.c_cc[VMIN] = 1;
	local_term_attributes.c_cc[VTIME] = 0;

	if (tcsetattr(STDIN_FILENO, TCSANOW, &local_term_attributes)) {
		fprintf(stderr, "Could not set terminal attributes!\n");
		return;
	}

	term_attributes_were_set = 1;
}

static void os_exit_line_edit_mode(void)
{

	if (!term_attributes_were_set) {
		return;
	}

	/* Set terminal attributes back to the original values */

	if (tcsetattr(STDIN_FILENO, TCSANOW, &original_term_attributes)) {
		fprintf(stderr, "Could not restore terminal attributes!\n");
	}